Pumping jack



. 1,592,391 E. E. STEVENSON PUMPING JACK July 13 1926.

Filed August 18 1925 2 Shets-Sheet 1 H\\|| mm ll 1 H HHH H l July 131926. 1

E. E. STEVENSON PUMPING JACK Filed August 18, 1925 2 Sheet-Sheet 2Irma/2Z0)".

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Patented July 13,1926.

TUNITED STATES PATENT OFFICE.

EDWARD E. STEVENSON, OF LOS ANGELES, CALIFORNIA, ASSIGNOR T D. 8:. B.PUMP & SUPPLY COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OFCALI- romvm.

rumrmo JACK.

Application filed August 18, 1925. Serial No. 50,930.

This invention has to do generally with pumping apparatus and is moreparticularly concerned with pumping jacks used for re- 'ciprocating deepwell pumps of the plunger '5 type.

It is particularly desirable that the pumping stroke be comparativelyslow and of considerable length, but this is diflicult, in fact,practically impossible 'of accomplishment when using the ordinarywalking'beam type of jack. This is mainly forthe reason'that the extremechanges in angularity between connecting rod and beam occurring when thepumping stroke is of exceptional length,

prohibitively reduce the efficiency of the devices. The radial movementof the walking beam together withthe necessary traversing movement ofthe crank end of the connecting rod bring about the variable angularityof beam and rod, and it is this aggregate relative movement between rodand beam that renders usual walking beam types of jacks unsuited forlong-stroke plunger pumps.

Therefore, it isthe general object of the present invention to provide awalking beam type of jack wherein the variable angularity between beamand connecting rod is reduced to such an extent that the jack is capableof delivering relative long, slow strokes to the associated pump rod. Ido this by practically eliminating lateral movement of the crank end ofthe connecting rod, that is, with the rod initially in verticalposition, operation of the jack reciprocates the connecting rod througha substantially vertical, straight line path. How this is done maybe-better understood'from the following detailed specification.

It is also my purpose to provide an eificient jack of the type describedwhich is relatively easily and cheaply manufactured, and of extremelysimple construction.

Reference will be made to the accompanying drawings, in which: i Fig. 1is anelevation of a t pical walk ing beam jack with one embodiment of myinvention shown in connection therewith; Fig. 2 is'an enlargedfragmentary view,

with parts broken away and contracted, of the mechanism in changedposition;

Fig. 3 is a side elevation of Fig. 2 as viewed from the left thereof;

Fig. 4 is a view of a variational embodiment. of the invention;

gig. 5 is another variational embodiment; an

Fig. 6 is still another variational embodiment. .1

A typical derrick flooring is indicated at 10 but it will be understoodthat while I have specified such a flooring in my claims in order torelativelylocate the various elements, this is not to be construed as inany way limitative on said claims, for the elements may be supported onany suitable type of foundation.

Walking beam 11 is mounted for oscillation on the floor supported'Samsonpost 12 in the usual manner, the work arm 13 of the beam carrying anysuitable type of suspension device 14 for pump rod 15, the latter beingconnected through the usual line of sucker rods (not shown) to the pumpplunger (not shown) all in a manner wherev by the upstroke of arm 13lifts the plunger,

while the rods and plunger are allowed to gravitate during the downstroke of said arm.

The power arm 16 of the beam has a bearing 17 which rotatably supportscross pin 18 on the end of connecting rod 19, collars 20 holding the pinfrom longitudinal displacement. Rod 19 is disposed at one side of arm 16and carries at its lower end a remov-. able bolt 21 which. extendshorizontally oppositely from pin 18. I

Anchored on floor 10 beneath the beam are pillow blocks 22 for powershaft 23, sprocket 24 or any suitable substitute providing means fortransmitting rotary movement to the shaft from: a power source (notshown).

Shaft 23 carries drive sprocket 24. A relatively large and bodilymovable driven sprocket is shown at,25, there being a chain 26 adaptedto drivingly connect the sprockets 24, 25. Connecting rod 19 is adgptedto measured distances from the sprockets axisof rotation A. The severalholes 27 provide adjustment for varying the stroke of the beam. 1

The work on the end of beam arm 13 is of such edective down-bearingforce that arm 16 is constantly urged upwardly with su'flicient force tosupport sprocket 25 and maintain chain 26 under constant tension.

Preferably, sprocket 25 is counterbalanced by weight G which is aflixedthereto at 25, for instance; said weight preferably being located so itscenter of gravity lies approximately in the line of centers of sprocket25 and bolt 21. The purpose of this coun terbalance is self-evident.

It will be seen thatwith this condition existing, rotation of sprocket24: causes coincidentrotation of sprocket 25 and that the last namedsprocket Wlll move to and fro through a circumferential path, determinedby chain 26, about sprocket 24 as a center, the upthrusting force of arm16 holding sprocket 25 to circumferential, bodily movement through thepredetermined path. Rotation of sprocket 25 causes reciprocation of rod19 and hence oscillation of beam 11, the coincident circumferentialmovement of the sprocket allowing rod 19 to reciprocate through asubstantially straight-line vertical path, thus reducing the variationin angularity between the connecting rod and walking beam to a minimum.

In order that/there may always be as sured suficient down bearing forceon arm 13 to support sprocket 25 and hold the chain tight, I may providea weight 28 on said arm, the weight being shiftable therealong to varyits efi'ect and having a strap 29 whereby it may be bolted to the beaminany one of a number of adjusted positions, as determined by bolt holes30 provided in the beam. Of course, any other suitable means, preferablyadjustable, may be employed for holding the weight to the beam, withoutdeparting from the spirit and scope of the invention In Fig. a l haveillustrated a modification wherein intermeshing drive gear 31 and drivengear 32 are substituted for sprockets 24 and 25, respectively, thearrangement otherwise being similar to Fig, 1 except that no drive chainis necessary, while a radius rod 33 is provided between shaft 23 and acentral stubshaft 32 on gear 32. This rod ,holds the gears in mesh butallows the requisite bodily circumferential movement of gear 32 aboutgear 31.

Fig. 6 illustrates an embodiment of the device similar to Fig. 1, butshows a radius rod 3% between shaft 23 and central stub shaft 35 onsprocket 25, there then being no necessity for depending upon the downbearing force on work arm 13 tohold the drive chain under tension,though there must.

be sufficient weight there applied to keep the weight of the sprocketfrom pulling the beam down.

In Fig. 5 is shown a variational embodiment of the 1 invention, whereindriven sprocket 25 is directly applied to beam 11 rather than through aconnecting rod; shaft 18 combining the described function of shafts l8and bolt 21 in the embodiment illustrated in Figs. 1 and 2.

It will be understood the drawings and description are to be consideredmerely as illustrative of and not restrictive on the broader claimsappended hereto, for various changes in design, structure andarrangement may be made without departing from the spirit and scope ofsaid claims.

I claim: 4

1. A pump jack embodying a walking beam mounted for oscillation above aderrick flooring, a rotatable drive Wheel in fixed position on theflooring beneath the beam, means for imparting rotary movement to thedrive wheel, a rotatable driven wheel intermediate the beam and drivingwheel, said driven wheel being bodily movable to and fro through apredetermined circumferential path about the drive wheel as a center,means for holding the driven wheel to bodily movement through said path,drive connective means between the wheels, and a connecting rodconnecting the beam and driven wheel, said connecting rod being appliedto the wheel at a point radially spaced from its axis of rotation; allin a manner whereby rotation of the drive wheel imparts oscillatorymovement to the walking beam.

2.'A pumping jack embodying a walking beam mounted for oscillation abovea derrick flooring, a rotatable drive sprocket in fixed position on theflooring beneath the beam, means for imparting rotary movement to thedrive sprocket, a rotatable, bodily movable driven sprocket intermediatethe beam and driving Wheel, said driven sprocket being movable bodily toand fro through a predetermined circumferential path about the drivesprocket as a center, means for holding the driven sprocket to bodilymovement through said path, a drive chain connecting the sprockets, aconnecting rod connecting the beam and driven sprocket, said connectingrod being applied to said sprocket at a point radially spaced from itsaxis of rotation, all in a manner whereby rotation of the drive wheelimparts oscillatory movement to the walking beam.

3. A pumping jack embodying a walking beam mounted for oscillation abovea derrick flooring, a rotatable drive sprocket in fixed position on theflooring beneath the beam,

means for imparting rotary movement to.

the drive sprocket, a rotatable, bodily movable driven sprocketintermediate the beam and driving wheel, said driven sprocket beingmovable bodily to and fro through a predetermined circumferential pathabout the drive sprocket as a center, a drive chain connecting thesprockets, a connecting rod connecting the power arm of the beam and thedriven sprocket, said connecting rod being applied to said sprocket at apoint ra dially spaced from its axis of rotation, and

means for-applying weight to the work arm of the beam in a manner tosupport the driven sprocket through the connecting rod, and therebyconstantly maintain said chain under tenslon.

4. A pumping jack embodying a walking beam mounted for oscillation abovea derrick flooring, a rotable drive sprocket in fixed position on theflooring beneath the beam,

-means for imparting rotary movement to for applying weight to the workarm of the beam in a manner to support the: driven sprocket through theconnecting rod and thereby constantly maintain said chain under tension.

5. A pumpin jack embodying a walking beam mounted or oscillation above aderrick flooring, a rotatable drive sprocket in fixed position on theflooring beneath the beam, means for imparting rotary movement to thedrive sprocket, a rotatable, bodily movable driven sprocket intermediatethe beam and driving Wheel, said driven sprocket being movable bodily toand, fro through a predetermined circumferential path about the drivesprocketas a center, a drive chain connecting the sprockets, aconnecting rod connecting the power arm of the beam and the drivensprocket, said'connecting rod being applied to said sprocket at a pointradially spaced from its axis of rotation, and a weight applied to thework arm of the beam for holding it in'a manner to support the' drivensprocket through the connecting rod and thereby constantly maintain saidchain under tension.

6. A pumping jack embodying a walking beam mounted for oscillation abovea derrick flooring, a rotatable drive sprocket in fixed position on theflooring beneath the beam, means for imparting rotary movement to thedrive sprocket, a rotatable, bodily movable driven sprocket intermediatethe beam and driving wheel, said driven sprocket being movable bodily toand fro through a predetermined circumferential path about the drivesprocket as a center, a drive chain connecting the sprockets, aconnecting rod connecting the power arm of the beam and the drivensprocket, said connecting rod being applied to said sprocket at a pointradially spaced from its axis of rota tion, and a weight adjustablyapplied to the work arm of the beam for holding it in a manner tosupport the driven sprocket through the connecting rod and therebyconstantly maintain said chain under tension.

7. A pumping jack embodying a walking beam mounted for oscillation abovea derrick flooring, a rotatable drive sprocket in fixed position on theflooring beneath the beam, means for imparting rotary movement to thedrive sprocket, a rotatable, bodily movable and counterbalanced drivensprocket intermediate the beam and driving wheel, said driven sprocketbeing movable bodily to and fro through a predetermined circumferentialpath about the drive sprocket as a' center, a drive chain connecting thesprockets, a connecting rod connecting the power arm of the beam and the'driven sprocket, said connecting rod bein applied to said sprocketat apoint radially spaced from its axis of rotation, and means for applyingweight to the Work arm of the beam in a manner to support the drivensprocket through the connecting rod, and thereby constantly maintainsaid chain under tension.

8. A pumping jack embodying a walking beam mounted for oscillation abovea derrick flooring, a rotatable drive sprocket in fixed position on theflooring beneath the beam, means for imparting rotary movement to thdrive sprocket, a rotatable, bodily movable and counterbalanced drivensprocket intermediate the beam and driving wheel, said driven sprocketbeing movable bodily to and fro through a predetermined circumferentialpath about the drive sprocket as a center, a

drive chain connecting the sprockets, said chain being adapted todetermine the circumferential path of the driven sprocket, a connectingrod connecting the power arm of the beam and the driven sprocket, saidconnecting rod being applied to said sprocket at a point radially spacedfrom its axis of rotation, and means for applying weight to the work armof the beam in a manner to support the driven sprocket through theconnecting rod and thereby constantly maintain said chain under tension.

9. A pump jack embodying a walking beam mounted for oscillation, arotatable drive sprocket fixed against bodily movement with respect tothe beam, means for imparting rotary movement to the drive sprocket, adriven sprocket connected to and support ed by the beam and being bodilymovable to and fro through a predetermined circumferential path aboutthe drive sprocket as a center; and a drive chain connecting thesprockets; the efiective point of connection W between the beam anddriven sprocket bein radially spaced from the axis of rotation o 10 saiddriven sprocket.

In witness that I claim the foregoing I have hereunto subscribed my namethis 30 day of July 1925. i

EDWARD 1E. STEVENSON.

